<template>
<div>
  <div class="goods">
    <div class="menu-wrapper" ref="menuWrapper">
        <ul>
            <li v-for="(item, index) in goods" class="menu-item border-1px" :class="{'current': currentIndex === index}" @click.stop.prevent="selectMenu($event,index)" ref="menuList">
                <span class="text">
                    <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>{{item.name}}
                </span>
            </li>
        </ul>
    </div>
    <div class="foods-wrapper" ref="foodWrapper">
        <ul>
            <li v-for="item in goods" class="food-list food-list-hook">
                <h1 class="title">{{item.name}}</h1>
                <ul>
                    <li v-for="food in item.foods" class="food-item border-1px">
                        <div class="icon">
                            <img width=57 height=57 :src="food.icon">
                        </div>
                        <div class="content">
                            <h2 class="name">{{food.name}}</h2>
                            <p class="desc">{{food.description}}</p>
                            <div class="extra">
                                <span>月售{{food.sellCount}}份</span><span>好评率{{food.rating}}%</span>
                            </div>
                            <price :food="food"></price>
                            <div class="cartcontrol-wrapper">
                                <cartcontrol @add="addFood" :food="food"></cartcontrol>
                            </div>
                        </div>
                    </li>
                </ul>
            </li>
        </ul>
    </div>
    <shopcart ref="shopcart" :selectFoods="selectFoods" :deliveryPrice="seller.deliveryPrice" :min-price="seller.minPrice"></shopcart>

  </div>
  <food @add="addFood" :food="selectedFood" ref="food"></food>
</div>
</template>

<script type="text/ecmascript-6">
import BScroll from "better-scroll";
import shopcart from "components/shopcart/shopcart";
import cartcontrol from "components/cartcontrol/cartcontrol";
import food from "components/food/food";
import price from "components/price/price";
import { data } from "common/js/data";
export default {
  props: {
    seller: {
      type: Object
    }
  },
  data() {
    return {
      goods: [],
      listHeight: [],
      scrollY: 0,
      selectedFood: {}
    };
  },
  created() {
    this.classMap = ["decrease", "discount", "special", "invoice", "guarantee"];
    this.goods = data().goods;
    this.$nextTick(() => {
      this._initScroll();
      this._calculateHeight();
    });
  },
  methods: {
    _initScroll() {
      this.menuScroll = new BScroll(this.$refs.menuWrapper, {
        click: true
      });
      this.foodsScroll = new BScroll(this.$refs.foodWrapper, {
        click: true,
        probeType: 3
      });
      this.foodsScroll.on("scroll", pos => {
        this.scrollY = Math.abs(Math.round(pos.y));
      });
    },
    _calculateHeight() {
      let foodList = this.$refs.foodWrapper.getElementsByClassName(
        "food-list-hook"
      );
      let height = 0;
      this.listHeight.push(height);
      for (let i = 0; i < foodList.length; i++) {
        let item = foodList[i];
        height += item.clientHeight;
        this.listHeight.push(height);
      }
    },
    selectMenu(event, index) {
      if (!event._constructed) {
        return;
      }
      let foodList = this.$refs.foodWrapper.getElementsByClassName(
        "food-list-hook"
      );
      let el = foodList[index];
      this.foodsScroll.scrollToElement(el, 300);
    },
    selectFood(food, event) {
      if (!event._constructed) {
        return;
      }
      this.selectedFood = food;
      this.$refs.food.show();
    },
    addFood(target) {
      this._drop(target);
    },
    _followScroll(index) {
      let menuList = this.$refs.menuList;
      let el = menuList[index];
      this.menuScroll.scrollToElement(el, 300, 0, -100);
    },
    _drop(target) {
      // 体验优化,异步执行下落动画
      this.$nextTick(() => {
        this.$refs.shopcart.drop(target);
      });
    }
  },
  computed: {
    currentIndex() {
      for (let i = 0; i < this.listHeight.length; i++) {
        let height1 = this.listHeight[i];
        let height2 = this.listHeight[i + 1];
        if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
          this._followScroll(i);
          return i;
        }
      }
      return 0;
    },
    selectFoods() {
      let foods = [];
      this.goods.forEach(good => {
        good.foods.forEach(food => {
          if (food.count) {
            foods.push(food);
          }
        });
      });
      return foods;
    }
  },
  components: {
    shopcart,
    cartcontrol,
    food,
    price
  }
};
</script>

<style lang="stylus" rel="stylesheet/stylus">
@import '../../common/stylus/mixin.styl';
@import '../../common/stylus/base.styl';

.goods {
    display: flex;
    position: absolute;
    width: 100%;
    top: 174px;
    bottom: 46px;
    overflow: hidden;

    .menu-wrapper {
        flex: 0 0 80px;
        width: 80px;
        background: #f3f5f7;

        .menu-item {
            display: table;
            height: 54px;
            width: 56px;
            line-height: 14px;
            padding: 0 12px;
            border-1px(rgba(7, 17, 27, 0.1));

            &.current {
                position: relative;
                z-index: 10;
                margin-top: -1px;
                background: #fff;
                font-weight: 700;

                .text {
                    border-none();
                }
            }

            &:last-child {
                border-none();
            }

            .icon {
                display: inline-block;
                vertical-align: top;
                width: 12px;
                height: 12px;
                background-size: 12px 12px;
                margin-right: 2px;
                background-repeat: no-repeat;

                &.decrease {
                    bg-image('decrease_3');
                }

                &.discount {
                    bg-image('discount_3');
                }

                &.guarantee {
                    bg-image('guarantee_3');
                }

                &.invoice {
                    bg-image('invoice_3');
                }

                &.special {
                    bg-image('special_3');
                }
            }

            .text {
                display: table-cell;
                width: 56px;
                vertical-align: middle;
                font-size: 12px;
            }
        }
    }

    .foods-wrapper {
        flex: 1;

        .title {
            padding-left: 14px;
            height: 26px;
            line-height: 26px;
            border-left: 2px solid #d9dde1;
            font-size: 12px;
            color: rgb(147, 153, 159);
            background: #f3f5f7;
        }

        .food-item {
            display: flex;
            margin: 18px;
            padding-bottom: 18px;
            border-1px(rgba(7, 17, 27, 0.1));

            &:last-child {
                border-none();
                margin-bottom: 0;
            }

            .icon {
                flex: 0 0 57px;
                margin-right: 10px;
            }

            .content {
                flex: 1;
                overflow: hidden;

                .name {
                    margin: 2px 0 8px 0;
                    height: 14px;
                    line-height: 14px;
                    font-size: 14px;
                    color: rgb(7, 17, 27);
                }

                .desc, .extra {
                    line-height: 10px;
                    font-size: 10px;
                    color: rgb(147, 153, 159);
                }

                .desc {
                    line-height: 12px;
                    margin-bottom: 8px;
                }

                .extra {
                    .count {
                        margin-right: 12px;
                    }
                }

                .price {
                    font-weight: 700;
                    line-height: 24px;

                    .now {
                        margin-right: 8px;
                        font-size: 14px;
                        color: rgb(240, 20, 20);
                    }

                    .old {
                        text-decoration: line-through;
                        font-size: 10px;
                        color: rgb(147, 153, 159);
                    }
                }

                .cartcontrol-wrapper {
                    position: absolute;
                    right: 0;
                    bottom: 12px;
                    overflow: hidden;
                }
            }
        }
    }
}
</style>
